tamerlan traveled to russia last year. stayed about six months. the big question right now, though is how did he spend his time there? an nbc news terrorist analyst, robin mcfadden served as the special agent in charge and deputy assistant director foreintelligence operations. good to have you both in the studio. you've been anne interrogator, we're been talking about this, the throat injury the suspect has, he's in serious condition. how do you interrogate someone who can't speak? you ask questions and they write on a pad? >> that's one possibility, but here we have just another challenge on top of a challenge under these circumstances. first and foremost, it's the medical clearance from the doctors working hand and glove with the personnel, the investigators on-scene and then once that medical clearance is given, and actually even before then, there could be a period where there's a personal connection, or a bond with -- i've been in situations before, serious injuries, but before there's a full medical clearance, could you actually be in the ro